I spent tonight looking into the whole "camshaft and m50" scenario when i stumbled upon the idea of a new HFM. The gains seem to be really good (20 aprox.). What it does is takes the 3" plumbing and makes it 3.5". Granted I would need to get a cosmos 3.5" CAI which i was gonna do anyway, but I just wanted to know if you guys had any other info or insight into this modification?